Sonoff AirGuard TH Zigbee Temp & Humidity Sensor with Display Gen2

🌡️💧 Sonoff SNZB-02DR2 - Temperature and Humidity Sensor with Display

SONOFF AirGuard TH (SNZB-02DR2) is a versatile Zigbee 3.0 smart temperature and humidity sensor with a large, high-contrast 3.6" LCD display.

Monitor temperature and humidity in the eWeLink app via a Zigbee gateway and access detailed records for up to 6 months with maximum, minimum, and average curves, plus dew point and VPD analysis for clear, data-driven air quality insights. Reporting intervals can be adjusted based on threshold settings or loops, values can be calibrated, and comfort zones can be defined with alerts. The device offers two modes: Zigbee (for automation via gateway) and Proximity (direct phone connection without a gateway).

AirGuard TH operates reliably within a temperature range of -20 to 60 °C and 0 to 100% relative humidity, covering almost all home environments. In Zigbee mode, the "Remote T&H Display" feature allows the display to show data from another sensor on the same Zigbee network (with a compatible hub and SONOFF sensors such as SNZB-02P, SNZB-02WD, SNZB-02D, or SNZB-02LD).

* Supported devices for temperature: AirGuard TH (requires firmware v1.1.0 or later), SNZB-02P, SNZB-02D, SNZB-02WD, SNZB-02LD
* Remote device must be connected to the same SONOFF Zigbee gateway, including: Bridge-P, Bridge-U, NSPanel Pro, iHost

Works with other smart devices – such as humidifiers, air conditioners, and more – to automatically maintain a healthy and comfortable temperature and humidity throughout your home. Automatically triggers smart scenes and sends instant alerts to your phone when temperature or humidity exceeds set thresholds.

For simpler use of the AirGuard TH, you can connect the device directly to your phone. No hub is needed, and you can still enjoy real-time temperature and humidity monitoring and analysis within communication range.

Voice control with Alexa, Google Home, and other features allows you to check temperature and humidity readings simply using your voice.

All solutions work with Apple Home via Matter Bridge, integrating SONOFF Zigbee devices into your Apple ecosystem and enabling seamless control of connected devices.

Devices easily integrate with open-source platforms like Home Assistant using the SONOFF Dongle series, allowing you to create your own customized temperature control solution.

Compatibility

* Before adding the device, please update your gateway firmware to the latest version.

AirGuard Series Comparison

Key Features

• 📺 Large 3.6" Display: displays local and (in Zigbee mode) remote temperature and humidity values, plus daily min/max values at a glance.
• 📊 Powerful Data Analysis: real-time hourly view, daily/weekly/monthly/6-month history, dew point and VPD curves.
• 🔄 Dual-Location Comparison: display two different sensors (e.g., indoor and outdoor) simultaneously in Zigbee mode.
• 📈 Flexible Reporting: intervals based on threshold values or cycles for fine-tuning control.
• 📶 Proximity Mode: direct pairing and viewing on your phone via the eWeLink app without a gateway.
• ⚙️ Calibration & Comfort Zones: sensor data adjustment and definition of comfort zones with alerts.

Protocols & Compatibility

• 🔄 Modes: Zigbee 3.0 (automation, remote sensor display); Proximity (direct app connection).
• 🔌 Compatible Hubs: SONOFF ZBBridge-P/U, NSPanel Pro, iHost; USB Adapters: ZBDongle-E/P, Dongle-M, Dongle PMG24, Dongle LMG21.
• 🔓 Open Platforms: Home Assistant (ZHA and Zigbee2MQTT – ZHA may require custom script).
• 🌐 Ecosystems: Alexa / Google Home / SmartThings – T&H query support (features vary by platform).

Specifications

• 📛 Name / Model: AirGuard TH – SNZB-02DR2
• 📡 Wireless Connection: Zigbee (IEEE 802.15.4)
• 📺 Display: 3.6" LCD
• 🖥️ MCU: TLSR8656F512ET32
• 🔋 Power Supply: 3.0V DC (2× 1.5V), LR03 (AAA) batteries
• 🌡️ Operating Temperature: -20 to 60 °C; accuracy: ±0.2 °C; resolution: 0.1 °C / 0.1 °F
• 💧 Operating Humidity: 5–95% RH (non-condensing); accuracy: ±2% RH; display: 1% RH (0.1% in app)
• 📏 Dimensions: 95 × 70 × 18.2 mm
• ⚖️ Weight: 99.3 g (with batteries)
• 🖼️ Material: PC+ABS
• ✅ Certification: CE / FCC / RoHS; FCC ID: 2APN5-SNZB02DR2